volume control for clock

S

Socrates

Guest
Hello,
I have an electronic quartz clock with chimes that needs a volume control.
It has a 2 1/4 speaker and is way too loud for the room it is in. Is there
any place that makes a inline volume control that I might be able to use to
adjust this so it wouldn't be so loud. Please reply to the group.
Thanks, Marty
 
"Socrates" <news@locutus.org> wrote in message
news:DUJYj.28089$XZ1.1658@fe13.usenetserver.com...
Hello,
I have an electronic quartz clock with chimes that needs a volume control.
It has a 2 1/4 speaker and is way too loud for the room it is in. Is
there any place that makes a inline volume control that I might be able to
use to adjust this so it wouldn't be so loud. Please reply to the group.
Thanks, Marty
Click to expand...
Place a variable resistor in parallel with the speaker and adjust until you
get a
reasonable volume. You can then replace the variable resistor with a fix
resistor of similar value.
 
"Michael Black" <et472@ncf.ca> wrote in message
news:pine.LNX.4.64.0805202044150.10671@darkstar.example.org...
On Tue, 20 May 2008, Lord Garth wrote:


"Socrates" <news@locutus.org> wrote in message
news:DUJYj.28089$XZ1.1658@fe13.usenetserver.com...
Hello,
I have an electronic quartz clock with chimes that needs a volume
control.
It has a 2 1/4 speaker and is way too loud for the room it is in. Is
there any place that makes a inline volume control that I might be able
to
use to adjust this so it wouldn't be so loud. Please reply to the
group.
Thanks, Marty


Place a variable resistor in parallel with the speaker and adjust until
you
get a
reasonable volume. You can then replace the variable resistor with a fix
resistor of similar value.

If it's merely a clock, chanced are good that it's a piezoelectric
transducer, ie quite high impedance. So he may need to start with
quite a high value of resistor.

Michael
Click to expand...
He said 2.25" speaker so maybe not!
 
"Michael Black" <et472@ncf.ca> wrote in message
news:pine.LNX.4.64.0805202044150.10671@darkstar.example.org...
On Tue, 20 May 2008, Lord Garth wrote:


"Socrates" <news@locutus.org> wrote in message
news:DUJYj.28089$XZ1.1658@fe13.usenetserver.com...
Hello,
I have an electronic quartz clock with chimes that needs a volume
control.
It has a 2 1/4 speaker and is way too loud for the room it is in. Is
there any place that makes a inline volume control that I might be able
to
use to adjust this so it wouldn't be so loud. Please reply to the
group.
Thanks, Marty


Place a variable resistor in parallel with the speaker and adjust until
you
get a
reasonable volume. You can then replace the variable resistor with a fix
resistor of similar value.

If it's merely a clock, chanced are good that it's a piezoelectric
transducer, ie quite high impedance. So he may need to start with
quite a high value of resistor.

Michael
Click to expand...
He said 2.25" speaker so maybe not!
 
"Michael Black" <et472@ncf.ca> wrote in message
news:pine.LNX.4.64.0805202258340.10816@darkstar.example.org...
On Tue, 20 May 2008, Lord Garth wrote:


"Michael Black" <et472@ncf.ca> wrote in message
news:pine.LNX.4.64.0805202044150.10671@darkstar.example.org...
On Tue, 20 May 2008, Lord Garth wrote:


"Socrates" <news@locutus.org> wrote in message
news:DUJYj.28089$XZ1.1658@fe13.usenetserver.com...
Hello,
I have an electronic quartz clock with chimes that needs a volume
control.
It has a 2 1/4 speaker and is way too loud for the room it is in. Is
there any place that makes a inline volume control that I might be
able
to
use to adjust this so it wouldn't be so loud. Please reply to the
group.
Thanks, Marty


Place a variable resistor in parallel with the speaker and adjust until
you
get a
reasonable volume. You can then replace the variable resistor with a
fix
resistor of similar value.

If it's merely a clock, chanced are good that it's a piezoelectric
transducer, ie quite high impedance. So he may need to start with
quite a high value of resistor.

Michael

He said 2.25" speaker so maybe not!

He did, I missed that.

It seems odd though, because in a straight alarm clock (as opposed to
a clock radio) all the ones I've looked at use a piezoelectric transducer.


Michael
Click to expand...
I'd agree, it seem that only clock radios still use a speaker for the alarm.
I do like John's approach to balance the load impedance however. This
is an L pad.
 
On Tue, 20 May 2008, Lord Garth wrote:

"Socrates" <news@locutus.org> wrote in message
news:DUJYj.28089$XZ1.1658@fe13.usenetserver.com...
Hello,
I have an electronic quartz clock with chimes that needs a volume control.
It has a 2 1/4 speaker and is way too loud for the room it is in. Is
there any place that makes a inline volume control that I might be able to
use to adjust this so it wouldn't be so loud. Please reply to the group.
Thanks, Marty


Place a variable resistor in parallel with the speaker and adjust until you
get a
reasonable volume. You can then replace the variable resistor with a fix
resistor of similar value.

If it's merely a clock, chanced are good that it's a piezoelectric
Click to expand...
transducer, ie quite high impedance. So he may need to start with
quite a high value of resistor.

Michael
 
On Tue, 20 May 2008, Lord Garth wrote:

"Michael Black" <et472@ncf.ca> wrote in message
news:pine.LNX.4.64.0805202044150.10671@darkstar.example.org...
On Tue, 20 May 2008, Lord Garth wrote:


"Socrates" <news@locutus.org> wrote in message
news:DUJYj.28089$XZ1.1658@fe13.usenetserver.com...
Hello,
I have an electronic quartz clock with chimes that needs a volume
control.
It has a 2 1/4 speaker and is way too loud for the room it is in. Is
there any place that makes a inline volume control that I might be able
to
use to adjust this so it wouldn't be so loud. Please reply to the
group.
Thanks, Marty


Place a variable resistor in parallel with the speaker and adjust until
you
get a
reasonable volume. You can then replace the variable resistor with a fix
resistor of similar value.

If it's merely a clock, chanced are good that it's a piezoelectric
transducer, ie quite high impedance. So he may need to start with
quite a high value of resistor.

Michael

He said 2.25" speaker so maybe not!

He did, I missed that.
Click to expand...

It seems odd though, because in a straight alarm clock (as opposed to
a clock radio) all the ones I've looked at use a piezoelectric transducer.


Michael
 
On Tue, 20 May 2008 19:31:15 -0500, "Lord Garth" <lgarth@tantalus.net>
wrote:

"Socrates" <news@locutus.org> wrote in message
news:DUJYj.28089$XZ1.1658@fe13.usenetserver.com...
Hello,
I have an electronic quartz clock with chimes that needs a volume control.
It has a 2 1/4 speaker and is way too loud for the room it is in. Is
there any place that makes a inline volume control that I might be able to
use to adjust this so it wouldn't be so loud. Please reply to the group.
Thanks, Marty


Place a variable resistor in parallel with the speaker and adjust until you
get a
reasonable volume. You can then replace the variable resistor with a fix
resistor of similar value.
Click to expand...
---
Not a good idea since the driver may be overloaded by the lower
impedance of the speaker-resistor combination.

A better way would be be to keep the load impedance constant while
attenuating the input to the speaker, like this: (View in Courier)

VOUT>----[R1]--+-----+
| |
[R2] [ZL]
| |
GND>-----------+-----+

where:

R1 + (R2||ZL) = ZL

JF
 
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